JP7728076B2 - Container with cap - Google Patents

Description

The present invention relates to a capped container in which a cap is attached to the mouth of a container body.

For example, a known container for storing contents such as cosmetics or liquid detergent is a capped container that has a container body with a cylindrical opening with a male thread on the outer periphery, and a cap with a female thread on the inner periphery that is attached to the opening by threading the female thread onto the male thread.

A known example of such a capped container is one in which a stopper projection is provided on the outer peripheral surface of the mouth portion, extending downward from the end of the male thread. When the cap is screwed into the mouth portion to a predetermined rotational position, the start end of the female thread abuts against the stopper projection. This allows the cap screwed into the mouth portion to be stopped at the predetermined rotational position relative to the mouth (see, for example, Patent Document 1).

Japanese Utility Model Laid-Open Publication No. 53-025848

However, with the above-mentioned conventional capped containers, for example, if the tightening torque of the cap against the mouth is increased to ensure a tight seal, the start of the female thread abutting the stopper protrusion may not be able to withstand the tightening torque and may deform downward along the stopper protrusion, causing it to go over the stopper protrusion. In particular, when the cap is made of softer polyethylene or polypropylene than the container body made of polyethylene terephthalate, the female thread is more likely to deform and go over the stopper protrusion. As a result, conventional capped containers have the problem that it may not be possible to sufficiently increase the tightening torque of the cap against the mouth of the container body.

The present invention was developed to solve these problems, and its purpose is to provide a capped container that allows for an increased tightening torque of the cap against the mouth.

The capped container of the present invention is a capped container comprising a container body having a cylindrical mouth portion with a male thread on its outer peripheral surface, and a cap having a female thread on its inner peripheral surface and attached to the mouth portion by threading the female thread onto the male thread, and comprising: a stopper protrusion on the outer peripheral surface of the mouth portion extending downward from the end of the male thread; and a support protrusion on the outer peripheral surface of the mouth portion extending circumferentially from the stopper protrusion and positioned below the male thread, wherein when the cap is screwed into the mouth portion to a predetermined rotational position, the starting end of the female thread abuts against the stopper protrusion and is clamped between the male thread and the support protrusion, and the support protrusion extends circumferentially with a lead angle smaller than that of the male thread .

In the capped container of the present invention, in the above configuration, it is preferable that the starting end of the female thread is a plane perpendicular to the circumferential direction of the inner peripheral surface, and the portion of the stopper projection that abuts against the starting end of the female thread is a plane perpendicular to the circumferential direction of the outer peripheral surface.

In the capped container of the present invention, in the above configuration, it is preferable that the cap is formed from a material that is softer than the material forming the container body.

The present invention provides a capped container that allows for increased tightening torque of the cap relative to the mouth.

1 is a front view of a capped container according to an embodiment of the present invention. FIG. 2 is a front view of the container body shown in FIG. 1 . 2 is an enlarged cross-sectional view of the engaging portion between the mouth and the cap of the capped container shown in FIG. 1. FIG.

Below, a detailed example of a capped container 1 according to one embodiment of the present invention will be described with reference to the drawings.

As shown in Figure 1, the capped container 1 has a container body 10 and a cap 20.

In this specification and claims, "upper" means upper when the capped container 1 is in the upright position shown in Figure 1 (the position in which the cap 20 is positioned above the container body 10), and "lower" means the opposite.

As shown in Figure 2, the container body 10 is bottle-shaped, having a cylindrical mouth 11 and a body 12 that is integrally connected to the lower end of the mouth 11. The body 12 can be formed, for example, in the shape of a cylinder with a bottom, but its shape can be modified in various ways.

A male thread 13 is integrally formed on the outer peripheral surface of the mouth portion 11. The male thread 13 extends continuously in a spiral shape with a predetermined lead angle on the outer peripheral surface of the mouth portion 11 between a starting end 13a on the upper side (the side where screwing begins) and a terminal end 13b on the lower side (the side where screwing ends).

In this embodiment, the male thread 13 is a buttress thread in which the flank angle of the upward-facing flank is larger than the flank angle of the downward-facing flank, but its shape can be modified in various ways.

An annular neck ring 14 may be provided on the outer peripheral surface of the mouth portion 11, positioned below the male threads 13.

The container body 10 configured as described above can be formed, for example, by blow molding or injection molding of a synthetic resin material.

As shown in Figure 1, the cap 20 is cylindrical and has a cylindrical side wall 21 with a larger diameter than the mouth 11, and a top wall 22 that is integrally connected to the upper end of the side wall 21.

As shown in FIG. 3, a female thread 23 is integrally formed on the inner peripheral surface of the side wall 21. The female thread 23 extends continuously in a spiral shape on the inner peripheral surface of the side wall 21 between its lower starting end 23a and its upper terminal end (not shown) at the same lead angle as the male thread 13. The female thread 23 can be threadably coupled to the male thread 13, and the cap 20 is attached to the mouth portion 11 by threading the female thread 23 onto the male thread 13.

In this embodiment, the female thread 23 corresponds to the male thread 13 and is a buttress thread in which the flank angle of the downward-facing flank is larger than the flank angle of the upward-facing flank, but its shape can be modified in various ways.

A cylindrical seal portion 24 that fits into the inner circumferential surface of the mouth portion 11 can also be integrally formed on the underside of the top wall 22.

The cap 20 configured as described above can be formed, for example, by injection molding synthetic resin material.

As shown in Figures 2 and 3, a stopper protrusion 15 and a support protrusion 16 are provided on the outer peripheral surface of the mouth portion 11.

The stopper protrusion 15 is a rectangular block that protrudes radially outward from the outer peripheral surface of the mouth portion 11. It is connected to the terminal end 13b of the male thread 13 and extends downward from the terminal end 13b. The stopper protrusion 15 is located on the path of movement in the screwing direction of the female thread 23 that is threadedly coupled to the male thread 13. Therefore, when the female thread 23 is threadedly coupled to the male thread 13 and the cap 20 is screwed into the mouth portion 11 to a predetermined rotational position, the starting end 23a of the female thread 23 abuts against the locking surface 15a of the stopper protrusion 15 (see Figure 2). When the starting end 23a of the female thread 23 abuts against the locking surface 15a of the stopper protrusion 15, rotation of the cap 20 relative to the mouth portion 11 is prevented, and the cap 20 stops at the predetermined rotational position relative to the mouth portion 11. In this way, when the cap 20 is screwed into the mouth 11 to a predetermined rotational position, the start end 23a of the female thread 23 abuts against the stopper protrusion 15, allowing the cap 20 to be stopped at the predetermined rotational position relative to the mouth 11.

The support protrusion 16 protrudes radially outward from the outer peripheral surface of the mouth portion 11 and extends circumferentially from the stopper protrusion 15. The direction in which the support protrusion 16 extends relative to the stopper protrusion 15 is the same as the direction in which the male thread 13 extends relative to the stopper protrusion 15, and the support protrusion 16 is located below the portion of the male thread 13 on the terminal end 13b side.

In this embodiment, the support protrusion 16 is formed in the shape of a buttress thread, similar to the male thread 13. The circumferential length of the support protrusion 16 is equal to or less than the circumferential length of the outer surface of the mouth portion 11.

The vertical distance between the male thread 13 and the support protrusion 16 is sufficient to accommodate the female thread 23. Furthermore, the vertical distance between the male thread 13 and the support protrusion 16 at the connection with the stopper protrusion 15 is equal to the vertical width of the starting end 23a of the female thread 23. As a result, when the cap 20 is screwed into the opening 11 to a predetermined rotational position and the starting end 23a of the female thread 23 abuts against the stopper protrusion 15, as shown in Figure 3, the starting end 23a of the female thread 23 is sandwiched between the male thread 13 and the support protrusion 16.

As described above, in the capped container 1 of this embodiment, the outer peripheral surface of the mouth 11 is provided with a stopper protrusion 15 extending downward from the terminal end 13b of the male thread 13, allowing the cap 20 screwed onto the mouth 11 to stop at a predetermined rotational position relative to the mouth 11. Furthermore, the outer peripheral surface of the mouth 11 is provided with a support protrusion 16 extending circumferentially from the stopper protrusion 15 and positioned below the male thread 13. When the cap 20 is screwed onto the mouth 11 to a predetermined rotational position, the starting end 23a of the female thread 23 abuts against the stopper protrusion 15 and is sandwiched between the male thread 13 and the support protrusion 16. Therefore, even if further tightening torque is applied to the cap 20 after the starting end 23a of the female thread 23 abuts against the stopper protrusion 15, the starting end 23a of the female thread 23 to which the tightening torque has been applied is sandwiched between the male thread 13 and the support protrusion 16, preventing deformation. This prevents the female thread 23 from climbing over the stopper protrusion 15, increasing the tightening torque of the cap 20 relative to the mouth 11. In other words, the stopper protrusion 15 and the support protrusion 16 form a U-shaped stopper at the end 13b of the male thread 13 that supports the start 23a of the female thread 23, thereby reliably preventing the female thread 23 from climbing over the stopper protrusion 15. In this way, the capped container 1 of this embodiment can provide a capped container 1 that can increase the tightening torque of the cap 20 relative to the mouth 11.

The support protrusions 16 can be configured to extend circumferentially at a lead angle smaller than that of the male thread 13. In this case, for example, the lead angle of the male thread 13 can be 3 degrees and the lead angle of the support protrusions 16 can be 2 degrees, but these lead angles can be changed depending on the required tightening torque, etc. By configuring the support protrusions 16 to extend circumferentially at a lead angle smaller than that of the male thread 13, the vertical distance between the male thread 13 and the support protrusions 16 can be configured to be smallest at the connection portion with the stopper protrusion 15 and to increase with increasing distance from the stopper protrusion 15. This prevents the start end 23a of the female thread 23 from getting caught on the circumferential end of the support protrusion 16 when the cap 20 is screwed into the mouth portion 11 to a predetermined rotational position, and prevents the start end 23a of the female thread 23 from being pinched between the male thread 13 and the support protrusion 16 until the cap 20 reaches the predetermined rotational position of the mouth portion 11. This prevents large sliding resistance from occurring in the female thread 23 between the male thread 13 and the support protrusion 16 during the tightening operation. This makes it easier to tighten the cap 20 onto the mouth portion 11.

The support protrusions 16 can also be configured to extend circumferentially at the same lead angle as the male threads 13. With this configuration, when the cap 20 is screwed into the mouth portion 11 to a predetermined rotational position and the start end 23a of the female threads 23 abuts the stopper protrusion 15, a predetermined length from the start end 23a of the female threads 23 corresponding to the circumferential length of the support protrusions 16 is clamped between the male threads 13 and the support protrusions 16, more reliably suppressing deformation of the portion of the female threads 23 on the start end 23a side. This makes it possible to further increase the tightening torque of the cap 20 relative to the mouth portion 11.

The capped container 1 can be configured such that the start 23a of the female thread 23 is a plane perpendicular to the circumferential direction of the inner peripheral surface of the sidewall 21, and the locking surface 15a of the stopper protrusion 15 that abuts against the start 23a of the female thread 23 is a plane perpendicular to the circumferential direction of the outer peripheral surface of the mouth portion 11. With this configuration, when the cap 20 is screwed into the mouth portion 11 to a predetermined rotational position, the start 23a of the female thread 23 and the locking surface 15a of the stopper protrusion 15 come into surface contact with each other. Therefore, when the cap 20 is screwed into the mouth portion 11 to a predetermined rotational position and the start 23a of the female thread 23 abuts against the locking surface 15a of the stopper protrusion 15, the application of force from the locking surface 15a of the stopper protrusion 15 to the start 23a of the female thread 23 in the radially outward or vertical direction is suppressed, allowing the start 23a of the female thread 23 to be more securely supported by the stopper protrusion 15. This more effectively prevents the female thread 23 from being unable to withstand the tightening torque, causing it to deform and climb over the stopper protrusion 15, thereby further increasing the tightening torque of the cap 20 against the mouth 11 of the container body 10.

The capped container 1 can be configured such that the cap 20 is made of a material softer than the material forming the container body 10. For example, in this embodiment, the container body 10 is made of polyethylene terephthalate, and the cap 20 is made of polypropylene, a material softer than the polyethylene terephthalate material forming the container body 10. By using a cap 20 made of a material softer than the material forming the container body 10 in this way, the sealing ability of the cap 20 around the mouth 11, such as in the cylindrical sealing portion 24, can be improved. Furthermore, with this configuration, the capped container 1 of this embodiment prevents the internal thread 23, made of a material softer than the container body 10, from climbing over the stopper protrusion 15, thereby increasing the tightening torque of the cap 20 against the mouth 11 of the container body 10.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention.

For example, in the above embodiment, the stopper projection 15 is a rectangular block, but this is not limited to this. The shape can be modified in various ways as long as it can engage the starting end 23a of the female thread 23 and prevent rotation of the cap 20.

In addition, while the above embodiment illustrates a case in which the container body 10 is made of polyethylene terephthalate and the cap 20 is made of polypropylene, the materials from which the container body 10 and cap 20 are made can be changed in various ways.

Furthermore, in the above embodiment, the support protrusions 16 are configured to extend circumferentially at an inclination with a lead angle along the outer peripheral surface of the mouth portion 11, but they can also be configured to extend circumferentially along the outer peripheral surface of the mouth portion 11 without a lead angle. Furthermore, the shape of the support protrusions 16 is not limited to a buttress thread shape and can be modified in various ways.

1 Container with cap 10 Container body 11 Mouth portion 12 Body portion 13 Male thread 13a Starting end 13b End 14 Neck ring 15 Stopper projection 15a Locking surface 16 Support projection 20 Cap 21 Side wall 22 Top wall 23 Female thread 23a Starting end 24 Cylindrical seal portion

Claims (3)

a container body having a cylindrical mouth portion provided with a male thread on its outer circumferential surface;
A cap having a female thread on an inner circumferential surface, the female thread being threadably coupled to the male thread and attached to the opening,
a stopper projection provided on the outer peripheral surface of the mouth portion and extending downward from the end of the male screw;
a support projection provided on an outer peripheral surface of the mouth portion, extending circumferentially from the stopper projection, and positioned below the male screw;
When the cap is screwed onto the opening portion to a predetermined rotational position, the start end of the female screw abuts against the stopper projection and is sandwiched between the male screw and the support projection,
A capped container , wherein the support projection extends in the circumferential direction at a lead angle smaller than that of the male thread . The starting end of the female thread is a plane perpendicular to the circumferential direction of the inner circumferential surface,
2. The capped container according to claim 1 , wherein a portion of the stopper projection that abuts against the starting end of the female screw is a flat surface that is perpendicular to the circumferential direction of the outer circumferential surface. 3. The capped container according to claim 1 , wherein the cap is made of a material softer than a material forming the container body.